low mood and anxiety! any advise please 😞

So I've been signed off work for two weeks down to my anxiety and the doctor said to go back at the end of my time off and speak about whether medication is the best option. I've been through so much in my life I know a lot of people have too probably worse but as happy as I try to be and should be it doesn't work, I'm either happy and talk for England or I'm sad and depressed and don't speak there is no in the middle. I've been with my fiancée just over 2yrs and we're happy but it's affecting our relationship because I constantly doubt him and doubt the way I look I feel so ugly and gross I hate the way I look. I compare my self to so many people. He agreed that medication could be an option but I'm scared as too how it will affect me and change me as a person. Has anyone on here been through medication, how did they find it? How does it affect your body and mind ? And relationships. Btw I've been offered Councilling and had it all my life and still no improvement. Anyone who knows what I'm going through please advise me😬😞